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《Acta Botanica Boreali-occidentalia Sinica》 2001-02
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The development of endosperm haustorium and the ultracytochemic localization of ATPase activity in the haustorium of watermelon

WANG Xiu ling 1,GAO Xin qi 1,ZHANG Heng yue 2 (1 Department of Biology,Qufu Normal University,Qufu,Shandong 273165,China;2 School of Life Science,Shandong Agriculture University,Taian,Shandong 271018,China)  
The development of endosperm haustorium in watermelon ( Citrullus lanatus ) was observed,and the ultracytochemical localization of ATPase activity was carried out in the endosperm haustorium cells.At the early globular embryo,the chalazal portion of the embryo sac grown into tubular haustorium,which still remained coenocytic.The haustorium cellularizated from the micropylar end to chalazal end at the later globular stage.When the embryo differentiated cotyledons,the haustorium cells gradually degenerated,then disappear.ATPase activity was mostly located on nucleus membrane,ERs and bulb like substances in wall of endosperm haustorium cells.When the haustorium cell began to degenerate,the reaction of ATPase activity on nucleus membrane is markedly reduced.With the degeneration of the endosperm haustorium,the high activity reaction of ATPase was almost localized in cell wall and intercellular spaces of haustorium cells,while the ATPase activity on nucleus membrane was hardly to see and a little enzyme activity was observed on ERs.
【CateGory Index】: Q944.57
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